Combined drill and underreamer



w. s. WARNER. COMBINED DRILL AND UNDERREAMER.

APPLICATION FILED JUNE 1, 1920- Patented Mar. 22, 1921 'WILLlAM' '1. S. WARNER, OF 'YUMA, ARIZONA.

'UUMIBINED .lJIELIlI L AND UNDERREAMER.

WWII-W l Specification 01": Letters Patent.

Patented Mar. 22,

Application filed June 1, 1920. Serial No. 385,569.

To all whom it may concern:

Be it lcnown that l, TVILLIAM T. S. Wennrn, a citizen of the lllnited States, residlng at Yuma, in the county of Yuma and State of Arizona, hare invented new and useful improvements in Combined llrrllsend Untlerrearners, oil which the following is a specification.

The present invention relates in general to drills for drilling Wells and the like, and has reference more particularly to a combined drill and underrearner, l

The primary object of the invention s to provide a structure of the class described which will enable the Well to he drilled and under-reamed to enlarge the hole for the Well casing in one endthe sarne operation.

An apparatus o'l' this lurid has many advantages, for instance, it will enable the drilling apparatus to he operated through the Well casing without reducing the diame ter of the hole.,'thus enabling the operator to keep the casing :lollowing close behind the drill at all. 1, and in this manner exclude surplus Water from the hole and avoid the inconvenience arising when the hole caves in, t ltill another advantage consists in enabling the hole to he drilled at any depth with hutone of easing throughout from top to bottom oi? the hole U The accompanying drawing illustrates one manner oil? reducing the invention to practice lln said drawing, Figure l is a vertical section or a well, illustrating the position the apparatus will assume inthe hole when raised above the hole floor. Fig. fl is a similar View showing" the apparatus dropped. l 3 is a vertical section of the top part of the apparatus. t isasectional View on the line l-l Fig. 3. Big. is a side elevation of the lower part of the apparatus and partly in section. Fig. 6 is a sectional View onthc line S -6 F 1g. 5, and l is a Vertical sectional View of the letter part of the apparatus lteterring new to the drawings in detail, for the purpose of convenience, the well will.

- he hereinafter referred to a hole and the hole may be drilled for any purpose, for instance, as an oil well or for the purpose of reaching Water under-ground, As is customary, particularly in drilling oil wells, sections of easing l are used the drilling proceeds, According to the present invcn tion the drilling apparatus will work Within the casing and of course extend below the end of the same to increase thcdepth of the hole. The drilling apparatus particularly the drill isnever of the same diameter as that of the casing. Consequently, it does not produce a hole with a diameter suilicicnt to accommodate the casing. As heretofore practised, the hole, after being made by the drill, is usually reamed out to accoinrnod ate the casing. With the present apparatus the drilling and reaming out of the hole is done in the same operation and by means which are arranged in cooperative relationship to effect such a result in the most convenient and satisfactory manner.

In reducing the invention to practice, it is proposed to, employ a suitable drill, tor instance, an ordinary so-called churn drill will suffice providing it has a tapered top portionfl adapted to have a threaded engagement 4 with the end of the drill rod 5 and with a set screw or the like 6 associated with. this threaded connection for preventing turning of the drill relative to the rod after it .has once been screwed into position. This drill rod 5 extends upwardly and is inclosed by a suitable casing l which snugly fits the same, at the same time ena bling the rod to reciprocate or slide therein,

without undue amountof friction. it sleeve 8 having a threaded engagement on the end of the casing is provided With a pair elf op positely disposed ears 9 made to connect a pair of links 10 through the hing The lower ends of these links are connec by means of a second set of hinges with the under-reams! spades 13. These underreamer spades are constructed with l', tively sharp and outwardly flaring cutting edges 14 and they are urther constructed p with a curvature which will enable them to conform to the contour of the tapering top part 3 of the bit 2. Arranged on the inside of each of the spades is a relatively narrow and elongated dovetail block 15 made as an integral part of the spades and adapted to I he confined in a dovetail groove 16 on opposite sides of the bit These dovetail grooves 16 are arranged pt allel to the sides ofthe tapering-part 3 of the hit. Consequently, they converge in a direction toward the top of the bit. Thus when the spades are caused to be guided downwardly, they will Ill be spread out, so-to-spealr, enabling their cutting edges 14 to act upon the hole and cut away the same to increase its diameter. As the spades are raised, or rather guided, upwardly, relatively to the bit they will be brought inwardly which will enable them to pass the end of the casing 1 so that the bit may be raised a sutlicient distance above the floor of the hole to effect the necessary drilling action. As the spades 13 are pri* marily carried by the sleeve 8 and, as stated, as the sleeve has a threaded engagement with the end of the casing 7, the throw of the spades may be adjusted by turning the sleeve 8 up or down. A locking device 17 is arranged to engage both the sleeve and the casing 7. This locking device comprises a metal strip having an inwardly presented spur 18 made to be received in an opening in the casing 7 and with its lower end received within a vertical groove in the sleeve 8. A suitable bolt 19 is made to securely hold the locking device on the casing '7 to maintain the spur 18 in the opening in the casing and the lower end ofthe device in the groove in the sleeve 8.

Arranged near the top of the rod 5 is a block 20 which is carried by a radial slot in the rod 5 nd made to project beyond the side thereof and made to be confined in the slots 21, provided on opposite sides of the casing 7. The block working in these slots provides a-stop for realizing the functioning of the device and inasmuch as theiirnpact between the block and the respective ends of the slots will be considerable, it is proposed to add solidity to the structure by using a pair of attached plates surrounding the slots which plates may be riveted or otherwise,

fixed to the casing. The block 20 is provided with a head 23 and a removable flange 24 which is confined on the opposite side of the block by means of bolts or the like. In this manner the-flange 241- may be removed and the block withdrawn through the radial slot to enable the rod 5 to be withdrawn from the casing 7. The head 23 and the removable flange 24 are adapted to overlie the plates 22 as their width is wider than that of the slots 21. The end of the rod 5 will terminate short of the top of the casing 7 and is not in any way fixed to the casing other than through means of the block 20 so that same may be free to slide up and down in the casing with such sliding movement restricted by the distance which the block 20 may move within the slots 21. The end of the casing 7 is threaded and made to receive a housing 25 of a swivel 26. A bolt 27 may be passed through the housing 25 and the casing 7 to effect a more or less permanently threaded engagement of these two parts. The swivel 26 is provided with an axial bore 28, the lower portion of which, namely 29, gradually increases in diameter the rod has a pair of. oppositely disposel vertical grooves extended substantially throughout its length. The dove-tailed grooves 16 are open at their bottoms so that any dirt or other matter which may get into the same may be ren'iovcd so as not. to

affect the proper functioning or rather the to sliding movement of the spades ill.

I claim:

1. A drilling apparatus including a drill. a drill rod, a casing surrounding the drill rod, means connecting the casing with the. drill rod permitting a limited sliding nun-ement of the rod therein, an undcr-reamer having an actuating connection with the easing and associated with the drill, and means for actuating the drill and under-rcainer in one and the same operation.

2. A drilling apparatus including a rela tively long rod, a drill adapted to be carried on the end of said rod, a casing surrounding the rod and terminating above the drill. said rod having a sliding movement in said casing and a stop for limiting said inc vmncnt comprising an elongated slot in the casing and means carriedhy a. rod and, extending in said slot, an under-reamcr comprising a pair of spade-lilre blades having cu ting edges and disposed on opposite sides of the drill, a link connection connccling the said blades with the casing. oppositel disposed guide-ways in the drill, means on the inner side of said blades having a sliding move ment in said guide-ways. and means for actuating the drill and the undcr-rcamcr in one aml the same operation.

A drilling apparatus as set Forth in claim 2 in which the ,llllli connection connecting the nmler-reamcr with the casino; is capable of a vertical adjustment with inmins for maintaining the same. i

l. A drilling apparatus cinbiidyiin: in its construction a drill having a tapered upper portion. a drill rod to which the drill is mounted, a casing surrounding said rod, said rod having a. sliding IllOVClllQlllL in the casing with a stop for limiting the same, on u1nler-reamer associated with the. drill and actuated in one. and the same operation as that of the drill and comprisimr a. pair of spade-like blades arranged, on opposite sides of the tapered upper part of the drill having guides on their inner sides. guide ways c."- temling vertically of the drill made to re ccive said guides. and. a link connection connecting the iin l n-reanier with the casing: wl'ierehy the sliding movement o." the rod loo HHS

Ill)

lilll "Within the eaeingwill actuate to manipw lelxe the umler-reemer to throw the blades elevmwerclly and outwardly of the cl1.ill in ene tlireetien and upwardly and inwardly 0f the chill in. another directien.

ii A drilling emgemt'ue as set forth in eleim Al in which the undel'e-reamer blades ewe meele with a curvature to conform to the drill, and, in which the blades are provided wlth outwardly flermg cutting edges.

6, A drlllmg appmetue, es set teeth m claim. 4 in which a swivel eofinectien is ranged at the upper end of the casing adapted to receive a, cable for actuating bath the drill and the uncler-reemelz WILLIAM T. S. WVAHNElElr 

